Blast furnace tuyere



July 19, 1932. J. A. BOLAND BLAST FURNACE TUYERE' Filed Aug. 23, 1950 2 Sheets-Sheet 2 INVENTOR 62816 7 A;

WITNESS Patented Jul 19, 1932' mm 1 STATES JEROME ngsonann'or BELLE vjem m vami "f Liisir run mcn'ruynnn it This invention pertains to impi ovements in t-uyeres of the type used for supplying based the furnace Wherea maximum rate of combustion is obtained, considerable corrosion of the tuyereorifice results. This corrosion is augmentedzby abrasion, particularly from the mechanical action ofthe charge as itsweight is imposed against the tuyeresection. Under such destructive influences the operation of theorifice becomes'impaired Previously also considerabledamage has 110 be cooled by the passage of fluid therethroughfor, when a Water cooled tuyere becomes broken, the presence of waterin'the furnace seriously impairs its operation. In the past it then has been necessary to replace the whole tuyere from timeto time.

Also, in blast furnaces the conformation of-theicharge and the conditions under which the furnace must .be operated frequently require modification of the point of application of the blast or of the shape of, the introducing orifice, or of both. This; too, has required the substitution of entirely different tuyeres. In some instances it has been necessary to re; place a tuyere having a certain size round or1- fice by a tuyere having a'difli'erent size or by an oval orifice,'for example, or at some period to employ a tuyere extending into the I charge a different distancethan required at 40 some other period.

such defects and also to providing substantial economies by providing replaceable or alterable tips or orifices fora given tuyere base. Thus, it will be possible to modify the operation of a tuyere simply by substituting suitably different orifices. The benefits of this invention further will become more apparent by referring to the drawings.

so In the drawings, Fig. 1 represents an as- Since they are located as conduits near the i ,ofjthe base, i v

1 Theconformation of the base at-its orifice resulted from the use of tuyeres constructed. outletend .Zinthe form illustrated in Figjsjl '7 This invention is directedto overcoming sembl'edtuyere and removable orifice 'tipQin longitudinal sectionj Figs; 2 and 3 jepfesent w .in longitudinal Section mo ified forms of" orificetips Fig. 4"repreSeIitsaIi end; yieWOf,

atiplwith ajcircular orifice; and Fig. 5 am;

l rl p i ahp uprime Fig. 6 rapier SQIi b e rm bf s l di tuyre andorifice tip. I

, I eql awing ia y' e en imuy "s I ignated by "the "numeral f1. comprises a I 0 hollow cylindrical body for base provided in" the Walls of the'base with suitable nieans'to coolfthetuyere by fluid circulation; In illustrative form shown; such means simply comprises a j acket 2 in the walls suitablypr'o g5 Vided Withinlet and outlet for the "circula' tion fa fiuid, for example'water, through and fi iislsuch ia's to'engage' a replaceable tip,

base at ithe lorificeiend is reduced external diameter. and likewise @the annularQwat'er jacket lisreduced in diameterjas shown in thejportionfi-l oflthe base; Thus engagement isprovided foranorifice tip to fitover the tip ofithetuyre,)with the orifice tip'in thenature Ora ea i "the form illustrated in -Ei -rs a ant c rre p di g d s tab f i g'th 'Q i h iuyr he l ge in intema flia t sQ-Ith nrifi p may esie ld inire ya i e d n al g' e' base wall. Thisportion of theinternal wall Qt the?twists. iides a e s 4 -l wIn this latter form the tip of the tuyere base estendsa ia t ngue sqm wh ti ito h ed if th io f-c member, Th 'or c befl d si na ed bylfihe umera '5 lntheie mil u' t e y arh ir -9 W of l heiii y re ba ia s e pr ci cally to the terminal face of the 1 replaceable Vtip, Suitable engagement will be hadto secure ,the'or fice tipto theflbasefi Insome. instances '9 met vit siv Lbs16 n we a e v ag As jshtwmig-a, suitable length 'of. the were in many'instances, and these advantages will of the surfaces.

7 surface thereof as a suitable bondgln any O h e cases t s o cldedifldiente e .unitethe base and the tip members ofthe tuyere by distinct lockingmeans; For, exam:

be enhanced by providing appropriate fitting It is proposed to form the orificermember of refractory material for some purposes and in such cases the engage ment may result from the plasticity either of the body, of the orifice member oriof; such material asmay be applied to the engaging ple, abayonet joint is a preferred form.

' Such bayonet lockis illustrated in the draw "ings fbyalug 6 on the base and-complementary rec ess 7- in the 'ori'fice' member. Other engagements would include threading orfce I hYmentinQg' the tipfto the base.

I reflectednotonly in the structure as a' Whole,

' u W th respect to its parts.

. using a'st'andardtuyere base for a Variety of orifice characteristics, since the only require-1 ment' win vbejto alter thejorifice itself. Further", it becomes possible to protect the tip'of the tilyere, particularly against its breaking andagainsLt Ieakage of the cooling fluid. With respect, to the orifice'tipitselfthis inventioncontemplates'a ide range of ene a teristic's'. if i i fMore partieularlygto describejthese orlfice tips; ofwhich it is 'proposed that a suitable" assortment the available for a given tuyere, 13; Variety of materials may be utilized; They should; be adapted to the 'c0nditions in" the" furnace With a minimum of depe'ndenceon a the tuyerebase. It will be particularlyyuse 'ful to construct the orifice member i of "re-,

fr'a'ctor'y material, for thus a" Wide range of characteristics is available. The refractory maybe modified as to its acidityor'ba'sicity or asi to its softeningpoint or 'as to its influonce on the combustion, and in 'othenrespects the adaptationof the contour of, the orifice V to meet conditions in the furnace. The orifice maybe made circular "or oval, as shown reknownto'the refractory art of itself. It may be molded on the base and'the n baked, either v beforeforafter the tuyere is 'replacedjin the 7 1 furnace." or, baked forms'may beprepared for replacement as] a "whole. These orifice by element 9, Fig.6, 1

ispectively inFigs. 4 ands, or may be given any desired contour; Further, the blast conof shapes. .Also the pointof application of It. Will permit.

' Aiparticul'ar advantage ofthis invention' is duit through the orifice mattemaybe given a parallel 'Walls, or converging, or diverging walls, as isillustrated respectively in Figs. 1, 2. and 8,'or given any desired combination the blast may be controlled; not only by theher, This .flexibility' is of extreme importance in combating the tendency of the charge to pillar in a bi a'st furnace. 1

The disclosure of this lnvent' on s has been presented to bomply With'the 'patent statute's.

tions beyond the necessary restrictions -im-- posed by the=prior'art3within the terms of the appended claims? I claim as my invention 2.

1. --A *b-last furnace tuyer'e'; comprising a j base of hollow wal-l structurejto contain an.

configuration ofthe blast= conduit,'but,a1so by changes in the length of the orfice' mem- Resort has been had to, specificillustrations, but such are not intended toimply any limital annular c'eolin'glchambe'r, and a refractory} terior diameter "to "provide an'j extension of the cooling chambergf and' the tipbeing re; 1

' orifice tip demo'untably' attached to thebjase;

the; base at the tip-end being of reduced 6X1 1 I c'essed'to fit as a hood over the cooling chamber-extensionof thebase for cooling the body ofz'the separablerefractory tip; I

- -21 blast furnace tuyere. comprising a} 3 tainanrannular cooling ..ch amber,- and a .re-' fractor y orificetip demountablyi attached to t the base, the base. atlits'tipg end being of re duced: exterioridiameter torprovide; an :BX-r V metalibase ,ofholloirswall structure to contension ofiithe cooling chainbehfand. having In testimony whereof, I sign nain'ek .a' locking lug extending-laterally'from' the V exterior cooling :chamber Lwall, I and the; ,tipf' I being recessed to interlock withthe lugand'i to fit as a hood over the :coolingchambe'r .exel j tension ofthe base, for cooling em ody; of the separable refractory tip. 1 r I J ROM A'.-'BOL.AND- 1 i" no 

